Based on the erotic game by 14rabbits.
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After college graduation, Tanaka Daisuke started working and living alone.  Even with the cheap, small, old, and untrustworthy boarding house ads, Tanaka-san immediately leaves his old boarding house.  What makes him interested in these ads?  If he pays the boarding house money on time, he will receive a special service from the Land Lady.  What might that special service be?  Having sex with the Land Lady with the small body of a child.
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(Source: Translated and Edited from Nekopoi)